spontaneous phagocytosis

例句：

1. 1. The bacteria were able to engulf the foreign material within a few hours.
   细菌能够在几小时内吞噬掉外来物质。
2. 2. This process is responsible for the natural defense of the body against infections.
   这个过程是身体自然防御感染的原因。
3. 3. The immune system uses this mechanism to eliminate harmful pathogens.
   免疫系统利用这种机制来消除有害病原体。